drivers/mtd/mtdchar.c

   1 /*
   2  * Character-device access to raw MTD devices.
   3  *
   4  */
   5
   6 #include <linux/device.h>
   7 #include <linux/fs.h>
   8 #include <linux/mm.h>
   9 #include <linux/err.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/sched.h>
  15 #include <linux/smp_lock.h>
  16
  17 #include <linux/mtd/mtd.h>
  18 #include <linux/mtd/compatmac.h>
  19
  20 #include <asm/uaccess.h>
  21
  22 static struct class *mtd_class;
  23
  24 static void mtd_notify_add(struct mtd_info* mtd)
  25 {
  26         if (!mtd)
  27                 return;
  28
  29         device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
  30                       NULL, "mtd%d", mtd->index);
  31
  32         device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
  33                       NULL, "mtd%dro", mtd->index);
  34 }
  35
  36 static void mtd_notify_remove(struct mtd_info* mtd)
  37 {
  38         if (!mtd)
  39                 return;
  40
  41         device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
  42         device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1));
  43 }
  44
  45 static struct mtd_notifier notifier = {
  46         .add    = mtd_notify_add,
  47         .remove = mtd_notify_remove,
  48 };
  49
  50 /*
  51  * Data structure to hold the pointer to the mtd device as well
  52  * as mode information ofr various use cases.
  53  */
  54 struct mtd_file_info {
  55         struct mtd_info *mtd;
  56         enum mtd_file_modes mode;
  57 };
  58
  59 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
  60 {
  61         struct mtd_file_info *mfi = file->private_data;
  62         struct mtd_info *mtd = mfi->mtd;
  63
  64         switch (orig) {
  65         case SEEK_SET:
  66                 break;
  67         case SEEK_CUR:
  68                 offset += file->f_pos;
  69                 break;
  70         case SEEK_END:
  71                 offset += mtd->size;
  72                 break;
  73         default:
  74                 return -EINVAL;
  75         }
  76
  77         if (offset >= 0 && offset <= mtd->size)
  78                 return file->f_pos = offset;
  79
  80         return -EINVAL;
  81 }
  82
  83
  84
  85 static int mtd_open(struct inode *inode, struct file *file)
  86 {
  87         int minor = iminor(inode);
  88         int devnum = minor >> 1;
  89         int ret = 0;
  90         struct mtd_info *mtd;
  91         struct mtd_file_info *mfi;
  92
  93         DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
  94
  95         if (devnum >= MAX_MTD_DEVICES)
  96                 return -ENODEV;
  97
  98         /* You can't open the RO devices RW */
  99         if ((file->f_mode & FMODE_WRITE) && (minor & 1))
 100                 return -EACCES;
 101
 102         lock_kernel();
 103         mtd = get_mtd_device(NULL, devnum);
 104
 105         if (IS_ERR(mtd)) {
 106                 ret = PTR_ERR(mtd);
 107                 goto out;
 108         }
 109
 110         if (MTD_ABSENT == mtd->type) {
 111                 put_mtd_device(mtd);
 112                 ret = -ENODEV;
 113                 goto out;
 114         }
 115
 116         /* You can't open it RW if it's not a writeable device */
 117         if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
 118                 put_mtd_device(mtd);
 119                 ret = -EACCES;
 120                 goto out;
 121         }
 122
 123         mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
 124         if (!mfi) {
 125                 put_mtd_device(mtd);
 126                 ret = -ENOMEM;
 127                 goto out;
 128         }
 129         mfi->mtd = mtd;
 130         file->private_data = mfi;
 131
 132 out:
 133         unlock_kernel();
 134         return ret;
 135 } /* mtd_open */
 136
 137 /*====================================================================*/
 138
 139 static int mtd_close(struct inode *inode, struct file *file)
 140 {
 141         struct mtd_file_info *mfi = file->private_data;
 142         struct mtd_info *mtd = mfi->mtd;
 143
 144         DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
 145
 146         /* Only sync if opened RW */
 147         if ((file->f_mode & FMODE_WRITE) && mtd->sync)
 148                 mtd->sync(mtd);
 149
 150         put_mtd_device(mtd);
 151         file->private_data = NULL;
 152         kfree(mfi);
 153
 154         return 0;
 155 } /* mtd_close */
 156
 157 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
 158    userspace buffer down and use it directly with readv/writev.
 159 */
 160 #define MAX_KMALLOC_SIZE 0x20000
 161
 162 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
 163 {
 164         struct mtd_file_info *mfi = file->private_data;
 165         struct mtd_info *mtd = mfi->mtd;
 166         size_t retlen=0;
 167         size_t total_retlen=0;
 168         int ret=0;
 169         int len;
 170         char *kbuf;
 171
 172         DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
 173
 174         if (*ppos + count > mtd->size)
 175                 count = mtd->size - *ppos;
 176
 177         if (!count)
 178                 return 0;
 179
 180         /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
 181            and pass them directly to the MTD functions */
 182
 183         if (count > MAX_KMALLOC_SIZE)
 184                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 185         else
 186                 kbuf=kmalloc(count, GFP_KERNEL);
 187
 188         if (!kbuf)
 189                 return -ENOMEM;
 190
 191         while (count) {
 192
 193                 if (count > MAX_KMALLOC_SIZE)
 194                         len = MAX_KMALLOC_SIZE;
 195                 else
 196                         len = count;
 197
 198                 switch (mfi->mode) {
 199                 case MTD_MODE_OTP_FACTORY:
 200                         ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 201                         break;
 202                 case MTD_MODE_OTP_USER:
 203                         ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 204                         break;
 205                 case MTD_MODE_RAW:
 206                 {
 207                         struct mtd_oob_ops ops;
 208
 209                         ops.mode = MTD_OOB_RAW;
 210                         ops.datbuf = kbuf;
 211                         ops.oobbuf = NULL;
 212                         ops.len = len;
 213
 214                         ret = mtd->read_oob(mtd, *ppos, &ops);
 215                         retlen = ops.retlen;
 216                         break;
 217                 }
 218                 default:
 219                         ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
 220                 }
 221                 /* Nand returns -EBADMSG on ecc errors, but it returns
 222                  * the data. For our userspace tools it is important
 223                  * to dump areas with ecc errors !
 224                  * For kernel internal usage it also might return -EUCLEAN
 225                  * to signal the caller that a bitflip has occured and has
 226                  * been corrected by the ECC algorithm.
 227                  * Userspace software which accesses NAND this way
 228                  * must be aware of the fact that it deals with NAND
 229                  */
 230                 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
 231                         *ppos += retlen;
 232                         if (copy_to_user(buf, kbuf, retlen)) {
 233                                 kfree(kbuf);
 234                                 return -EFAULT;
 235                         }
 236                         else
 237                                 total_retlen += retlen;
 238
 239                         count -= retlen;
 240                         buf += retlen;
 241                         if (retlen == 0)
 242                                 count = 0;
 243                 }
 244                 else {
 245                         kfree(kbuf);
 246                         return ret;
 247                 }
 248
 249         }
 250
 251         kfree(kbuf);
 252         return total_retlen;
 253 } /* mtd_read */
 254
 255 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
 256 {
 257         struct mtd_file_info *mfi = file->private_data;
 258         struct mtd_info *mtd = mfi->mtd;
 259         char *kbuf;
 260         size_t retlen;
 261         size_t total_retlen=0;
 262         int ret=0;
 263         int len;
 264
 265         DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
 266
 267         if (*ppos == mtd->size)
 268                 return -ENOSPC;
 269
 270         if (*ppos + count > mtd->size)
 271                 count = mtd->size - *ppos;
 272
 273         if (!count)
 274                 return 0;
 275
 276         if (count > MAX_KMALLOC_SIZE)
 277                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 278         else
 279                 kbuf=kmalloc(count, GFP_KERNEL);
 280
 281         if (!kbuf)
 282                 return -ENOMEM;
 283
 284         while (count) {
 285
 286                 if (count > MAX_KMALLOC_SIZE)
 287                         len = MAX_KMALLOC_SIZE;
 288                 else
 289                         len = count;
 290
 291                 if (copy_from_user(kbuf, buf, len)) {
 292                         kfree(kbuf);
 293                         return -EFAULT;
 294                 }
 295
 296                 switch (mfi->mode) {
 297                 case MTD_MODE_OTP_FACTORY:
 298                         ret = -EROFS;
 299                         break;
 300                 case MTD_MODE_OTP_USER:
 301                         if (!mtd->write_user_prot_reg) {
 302                                 ret = -EOPNOTSUPP;
 303                                 break;
 304                         }
 305                         ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 306                         break;
 307
 308                 case MTD_MODE_RAW:
 309                 {
 310                         struct mtd_oob_ops ops;
 311
 312                         ops.mode = MTD_OOB_RAW;
 313                         ops.datbuf = kbuf;
 314                         ops.oobbuf = NULL;
 315                         ops.len = len;
 316
 317                         ret = mtd->write_oob(mtd, *ppos, &ops);
 318                         retlen = ops.retlen;
 319                         break;
 320                 }
 321
 322                 default:
 323                         ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
 324                 }
 325                 if (!ret) {
 326                         *ppos += retlen;
 327                         total_retlen += retlen;
 328                         count -= retlen;
 329                         buf += retlen;
 330                 }
 331                 else {
 332                         kfree(kbuf);
 333                         return ret;
 334                 }
 335         }
 336
 337         kfree(kbuf);
 338         return total_retlen;
 339 } /* mtd_write */
 340
 341 /*======================================================================
 342
 343     IOCTL calls for getting device parameters.
 344
 345 ======================================================================*/
 346 static void mtdchar_erase_callback (struct erase_info *instr)
 347 {
 348         wake_up((wait_queue_head_t *)instr->priv);
 349 }
 350
 351 #ifdef CONFIG_HAVE_MTD_OTP
 352 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
 353 {
 354         struct mtd_info *mtd = mfi->mtd;
 355         int ret = 0;
 356
 357         switch (mode) {
 358         case MTD_OTP_FACTORY:
 359                 if (!mtd->read_fact_prot_reg)
 360                         ret = -EOPNOTSUPP;
 361                 else
 362                         mfi->mode = MTD_MODE_OTP_FACTORY;
 363                 break;
 364         case MTD_OTP_USER:
 365                 if (!mtd->read_fact_prot_reg)
 366                         ret = -EOPNOTSUPP;
 367                 else
 368                         mfi->mode = MTD_MODE_OTP_USER;
 369                 break;
 370         default:
 371                 ret = -EINVAL;
 372         case MTD_OTP_OFF:
 373                 break;
 374         }
 375         return ret;
 376 }
 377 #else
 378 # define otp_select_filemode(f,m)       -EOPNOTSUPP
 379 #endif
 380
 381 static int mtd_ioctl(struct inode *inode, struct file *file,
 382                      u_int cmd, u_long arg)
 383 {
 384         struct mtd_file_info *mfi = file->private_data;
 385         struct mtd_info *mtd = mfi->mtd;
 386         void __user *argp = (void __user *)arg;
 387         int ret = 0;
 388         u_long size;
 389         struct mtd_info_user info;
 390
 391         DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
 392
 393         size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
 394         if (cmd & IOC_IN) {
 395                 if (!access_ok(VERIFY_READ, argp, size))
 396                         return -EFAULT;
 397         }
 398         if (cmd & IOC_OUT) {
 399                 if (!access_ok(VERIFY_WRITE, argp, size))
 400                         return -EFAULT;
 401         }
 402
 403         switch (cmd) {
 404         case MEMGETREGIONCOUNT:
 405                 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
 406                         return -EFAULT;
 407                 break;
 408
 409         case MEMGETREGIONINFO:
 410         {
 411                 uint32_t ur_idx;
 412                 struct mtd_erase_region_info *kr;
 413                 struct region_info_user *ur = (struct region_info_user *) argp;
 414
 415                 if (get_user(ur_idx, &(ur->regionindex)))
 416                         return -EFAULT;
 417
 418                 kr = &(mtd->eraseregions[ur_idx]);
 419
 420                 if (put_user(kr->offset, &(ur->offset))
 421                     || put_user(kr->erasesize, &(ur->erasesize))
 422                     || put_user(kr->numblocks, &(ur->numblocks)))
 423                         return -EFAULT;
 424
 425                 break;
 426         }
 427
 428         case MEMGETINFO:
 429                 info.type       = mtd->type;
 430                 info.flags      = mtd->flags;
 431                 info.size       = mtd->size;
 432                 info.erasesize  = mtd->erasesize;
 433                 info.writesize  = mtd->writesize;
 434                 info.oobsize    = mtd->oobsize;
 435                 /* The below fields are obsolete */
 436                 info.ecctype    = -1;
 437                 info.eccsize    = 0;
 438                 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
 439                         return -EFAULT;
 440                 break;
 441
 442         case MEMERASE:
 443         {
 444                 struct erase_info *erase;
 445
 446                 if(!(file->f_mode & FMODE_WRITE))
 447                         return -EPERM;
 448
 449                 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
 450                 if (!erase)
 451                         ret = -ENOMEM;
 452                 else {
 453                         wait_queue_head_t waitq;
 454                         DECLARE_WAITQUEUE(wait, current);
 455
 456                         init_waitqueue_head(&waitq);
 457
 458                         if (copy_from_user(&erase->addr, argp,
 459                                     sizeof(struct erase_info_user))) {
 460                                 kfree(erase);
 461                                 return -EFAULT;
 462                         }
 463                         erase->mtd = mtd;
 464                         erase->callback = mtdchar_erase_callback;
 465                         erase->priv = (unsigned long)&waitq;
 466
 467                         /*
 468                           FIXME: Allow INTERRUPTIBLE. Which means
 469                           not having the wait_queue head on the stack.
 470
 471                           If the wq_head is on the stack, and we
 472                           leave because we got interrupted, then the
 473                           wq_head is no longer there when the
 474                           callback routine tries to wake us up.
 475                         */
 476                         ret = mtd->erase(mtd, erase);
 477                         if (!ret) {
 478                                 set_current_state(TASK_UNINTERRUPTIBLE);
 479                                 add_wait_queue(&waitq, &wait);
 480                                 if (erase->state != MTD_ERASE_DONE &&
 481                                     erase->state != MTD_ERASE_FAILED)
 482                                         schedule();
 483                                 remove_wait_queue(&waitq, &wait);
 484                                 set_current_state(TASK_RUNNING);
 485
 486                                 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
 487                         }
 488                         kfree(erase);
 489                 }
 490                 break;
 491         }
 492
 493         case MEMWRITEOOB:
 494         {
 495                 struct mtd_oob_buf buf;
 496                 struct mtd_oob_ops ops;
 497                 struct mtd_oob_buf __user *user_buf = argp;
 498                 uint32_t retlen;
 499
 500                 if(!(file->f_mode & FMODE_WRITE))
 501                         return -EPERM;
 502
 503                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 504                         return -EFAULT;
 505
 506                 if (buf.length > 4096)
 507                         return -EINVAL;
 508
 509                 if (!mtd->write_oob)
 510                         ret = -EOPNOTSUPP;
 511                 else
 512                         ret = access_ok(VERIFY_READ, buf.ptr,
 513                                         buf.length) ? 0 : EFAULT;
 514
 515                 if (ret)
 516                         return ret;
 517
 518                 ops.ooblen = buf.length;
 519                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 520                 ops.datbuf = NULL;
 521                 ops.mode = MTD_OOB_PLACE;
 522
 523                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 524                         return -EINVAL;
 525
 526                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 527                 if (!ops.oobbuf)
 528                         return -ENOMEM;
 529
 530                 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
 531                         kfree(ops.oobbuf);
 532                         return -EFAULT;
 533                 }
 534
 535                 buf.start &= ~(mtd->oobsize - 1);
 536                 ret = mtd->write_oob(mtd, buf.start, &ops);
 537
 538                 if (ops.oobretlen > 0xFFFFFFFFU)
 539                         ret = -EOVERFLOW;
 540                 retlen = ops.oobretlen;
 541                 if (copy_to_user(&user_buf->length, &retlen, sizeof(buf.length)))
 542                         ret = -EFAULT;
 543
 544                 kfree(ops.oobbuf);
 545                 break;
 546
 547         }
 548
 549         case MEMREADOOB:
 550         {
 551                 struct mtd_oob_buf buf;
 552                 struct mtd_oob_ops ops;
 553
 554                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 555                         return -EFAULT;
 556
 557                 if (buf.length > 4096)
 558                         return -EINVAL;
 559
 560                 if (!mtd->read_oob)
 561                         ret = -EOPNOTSUPP;
 562                 else
 563                         ret = access_ok(VERIFY_WRITE, buf.ptr,
 564                                         buf.length) ? 0 : -EFAULT;
 565                 if (ret)
 566                         return ret;
 567
 568                 ops.ooblen = buf.length;
 569                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 570                 ops.datbuf = NULL;
 571                 ops.mode = MTD_OOB_PLACE;
 572
 573                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 574                         return -EINVAL;
 575
 576                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 577                 if (!ops.oobbuf)
 578                         return -ENOMEM;
 579
 580                 buf.start &= ~(mtd->oobsize - 1);
 581                 ret = mtd->read_oob(mtd, buf.start, &ops);
 582
 583                 if (put_user(ops.oobretlen, (uint32_t __user *)argp))
 584                         ret = -EFAULT;
 585                 else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf,
 586                                                     ops.oobretlen))
 587                         ret = -EFAULT;
 588
 589                 kfree(ops.oobbuf);
 590                 break;
 591         }
 592
 593         case MEMLOCK:
 594         {
 595                 struct erase_info_user einfo;
 596
 597                 if (copy_from_user(&einfo, argp, sizeof(einfo)))
 598                         return -EFAULT;
 599
 600                 if (!mtd->lock)
 601                         ret = -EOPNOTSUPP;
 602                 else
 603                         ret = mtd->lock(mtd, einfo.start, einfo.length);
 604                 break;
 605         }
 606
 607         case MEMUNLOCK:
 608         {
 609                 struct erase_info_user einfo;
 610
 611                 if (copy_from_user(&einfo, argp, sizeof(einfo)))
 612                         return -EFAULT;
 613
 614                 if (!mtd->unlock)
 615                         ret = -EOPNOTSUPP;
 616                 else
 617                         ret = mtd->unlock(mtd, einfo.start, einfo.length);
 618                 break;
 619         }
 620
 621         /* Legacy interface */
 622         case MEMGETOOBSEL:
 623         {
 624                 struct nand_oobinfo oi;
 625
 626                 if (!mtd->ecclayout)
 627                         return -EOPNOTSUPP;
 628                 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
 629                         return -EINVAL;
 630
 631                 oi.useecc = MTD_NANDECC_AUTOPLACE;
 632                 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
 633                 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
 634                        sizeof(oi.oobfree));
 635                 oi.eccbytes = mtd->ecclayout->eccbytes;
 636
 637                 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
 638                         return -EFAULT;
 639                 break;
 640         }
 641
 642         case MEMGETBADBLOCK:
 643         {
 644                 loff_t offs;
 645
 646                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 647                         return -EFAULT;
 648                 if (!mtd->block_isbad)
 649                         ret = -EOPNOTSUPP;
 650                 else
 651                         return mtd->block_isbad(mtd, offs);
 652                 break;
 653         }
 654
 655         case MEMSETBADBLOCK:
 656         {
 657                 loff_t offs;
 658
 659                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 660                         return -EFAULT;
 661                 if (!mtd->block_markbad)
 662                         ret = -EOPNOTSUPP;
 663                 else
 664                         return mtd->block_markbad(mtd, offs);
 665                 break;
 666         }
 667
 668 #ifdef CONFIG_HAVE_MTD_OTP
 669         case OTPSELECT:
 670         {
 671                 int mode;
 672                 if (copy_from_user(&mode, argp, sizeof(int)))
 673                         return -EFAULT;
 674
 675                 mfi->mode = MTD_MODE_NORMAL;
 676
 677                 ret = otp_select_filemode(mfi, mode);
 678
 679                 file->f_pos = 0;
 680                 break;
 681         }
 682
 683         case OTPGETREGIONCOUNT:
 684         case OTPGETREGIONINFO:
 685         {
 686                 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
 687                 if (!buf)
 688                         return -ENOMEM;
 689                 ret = -EOPNOTSUPP;
 690                 switch (mfi->mode) {
 691                 case MTD_MODE_OTP_FACTORY:
 692                         if (mtd->get_fact_prot_info)
 693                                 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
 694                         break;
 695                 case MTD_MODE_OTP_USER:
 696                         if (mtd->get_user_prot_info)
 697                                 ret = mtd->get_user_prot_info(mtd, buf, 4096);
 698                         break;
 699                 default:
 700                         break;
 701                 }
 702                 if (ret >= 0) {
 703                         if (cmd == OTPGETREGIONCOUNT) {
 704                                 int nbr = ret / sizeof(struct otp_info);
 705                                 ret = copy_to_user(argp, &nbr, sizeof(int));
 706                         } else
 707                                 ret = copy_to_user(argp, buf, ret);
 708                         if (ret)
 709                                 ret = -EFAULT;
 710                 }
 711                 kfree(buf);
 712                 break;
 713         }
 714
 715         case OTPLOCK:
 716         {
 717                 struct otp_info oinfo;
 718
 719                 if (mfi->mode != MTD_MODE_OTP_USER)
 720                         return -EINVAL;
 721                 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
 722                         return -EFAULT;
 723                 if (!mtd->lock_user_prot_reg)
 724                         return -EOPNOTSUPP;
 725                 ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
 726                 break;
 727         }
 728 #endif
 729
 730         case ECCGETLAYOUT:
 731         {
 732                 if (!mtd->ecclayout)
 733                         return -EOPNOTSUPP;
 734
 735                 if (copy_to_user(argp, mtd->ecclayout,
 736                                  sizeof(struct nand_ecclayout)))
 737                         return -EFAULT;
 738                 break;
 739         }
 740
 741         case ECCGETSTATS:
 742         {
 743                 if (copy_to_user(argp, &mtd->ecc_stats,
 744                                  sizeof(struct mtd_ecc_stats)))
 745                         return -EFAULT;
 746                 break;
 747         }
 748
 749         case MTDFILEMODE:
 750         {
 751                 mfi->mode = 0;
 752
 753                 switch(arg) {
 754                 case MTD_MODE_OTP_FACTORY:
 755                 case MTD_MODE_OTP_USER:
 756                         ret = otp_select_filemode(mfi, arg);
 757                         break;
 758
 759                 case MTD_MODE_RAW:
 760                         if (!mtd->read_oob || !mtd->write_oob)
 761                                 return -EOPNOTSUPP;
 762                         mfi->mode = arg;
 763
 764                 case MTD_MODE_NORMAL:
 765                         break;
 766                 default:
 767                         ret = -EINVAL;
 768                 }
 769                 file->f_pos = 0;
 770                 break;
 771         }
 772
 773         default:
 774                 ret = -ENOTTY;
 775         }
 776
 777         return ret;
 778 } /* memory_ioctl */
 779
 780 static const struct file_operations mtd_fops = {
 781         .owner          = THIS_MODULE,
 782         .llseek         = mtd_lseek,
 783         .read           = mtd_read,
 784         .write          = mtd_write,
 785         .ioctl          = mtd_ioctl,
 786         .open           = mtd_open,
 787         .release        = mtd_close,
 788 };
 789
 790 static int __init init_mtdchar(void)
 791 {
 792         if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
 793                 printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
 794                        MTD_CHAR_MAJOR);
 795                 return -EAGAIN;
 796         }
 797
 798         mtd_class = class_create(THIS_MODULE, "mtd");
 799
 800         if (IS_ERR(mtd_class)) {
 801                 printk(KERN_ERR "Error creating mtd class.\n");
 802                 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 803                 return PTR_ERR(mtd_class);
 804         }
 805
 806         register_mtd_user(&notifier);
 807         return 0;
 808 }
 809
 810 static void __exit cleanup_mtdchar(void)
 811 {
 812         unregister_mtd_user(&notifier);
 813         class_destroy(mtd_class);
 814         unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 815 }
 816
 817 module_init(init_mtdchar);
 818 module_exit(cleanup_mtdchar);
 819
 820
 821 MODULE_LICENSE("GPL");
 822 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 823 MODULE_DESCRIPTION("Direct character-device access to MTD devices");